19442869 has 2 divisors, whose sum is σ = 19442870. Its totient is φ = 19442868.

The previous prime is 19442867. The next prime is 19442881. The reversal of 19442869 is 96824491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14326225 + 5116644 = 3785^2 + 2262^2 .

It is a cyclic number.

It is not a de Polignac number, because 19442869 - 2¹ = 19442867 is a prime.

It is a super-2 number, since 2×19442869² = 756050309902322, which contains 22 as substring.

Together with 19442867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19442867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9721434 + 9721435.

It is an arithmetic number, because the mean of its divisors is an integer number (9721435).

Almost surely, 2^19442869 is an apocalyptic number.

It is an amenable number.

19442869 is a deficient number, since it is larger than the sum of its proper divisors (1).

19442869 is an equidigital number, since it uses as much as digits as its factorization.

19442869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 43.

The square root of 19442869 is about 4409.4068762136. The cubic root of 19442869 is about 268.8975116636.

The spelling of 19442869 in words is "nineteen million, four hundred forty-two thousand, eight hundred sixty-nine".